<template>
	<div>
		<el-upload
			:action="uploadUrl"
			:before-upload="handleBeforeUpload"
			:on-success="handleUploadSuccess"
			:on-error="handleUploadError"
			name="file"
			:show-file-list="false"
			:headers="headers"
			style="display: none"
			ref="upload"
			v-if="this.type == 'url'"
		>
		</el-upload>
		<div class="editor" ref="editor" :style="styles"></div>
	</div>
</template>

<script>
import Quill from 'quill';
import 'quill/dist/quill.core.css';
import 'quill/dist/quill.snow.css';
import 'quill/dist/quill.bubble.css';
import { getToken } from '@/utils/auth';

export default {
	name: 'Editor',
	props: {
		/* 编辑器的内容 */
		value: {
			type: String,
			default: '',
		},
		/* 高度 */
		height: {
			type: Number,
			default: null,
		},
		/* 最小高度 */
		minHeight: {
			type: Number,
			default: null,
		},
		/* 只读 */
		readOnly: {
			type: Boolean,
			default: false,
		},
		/* 上传文件大小限制(MB) */
		fileSize: {
			type: Number,
			default: 5,
		},
		/* 类型（base64格式、url格式） */
		type: {
			type: String,
			default: 'url',
		},
	},
	data() {
		return {
			uploadUrl: process.env.VUE_APP_BASE_API + '/common/upload', // 上传的图片服务器地址
			headers: {
				Authorization: 'Bearer ' + getToken(),
			},
			Quill: null,
			currentValue: '',
			options: {
				theme: 'snow',
				bounds: document.body,
				debug: 'warn',
				modules: {
					// 工具栏配置
					toolbar: [
						['bold', 'italic', 'underline', 'strike'], // 加粗 斜体 下划线 删除线
						['blockquote', 'code-block'], // 引用  代码块
						[{ list: 'ordered' }, { list: 'bullet' }], // 有序、无序列表
						[{ indent: '-1' }, { indent: '+1' }], // 缩进
						[{ size: ['small', false, 'large', 'huge'] }], // 字体大小
						[{ header: [1, 2, 3, 4, 5, 6, false] }], // 标题
						[{ color: [] }, { background: [] }], // 字体颜色、字体背景颜色
						[{ align: [] }], // 对齐方式
						['clean'], // 清除文本格式
						['link', 'image', 'video'], // 链接、图片、视频
					],
				},
				placeholder: '请输入内容',
				readOnly: this.readOnly,
			},
		};
	},
	computed: {
		styles() {
			let style = {};
			if (this.minHeight) {
				style.minHeight = `${this.minHeight}px`;
			}
			if (this.height) {
				style.height = `${this.height}px`;
			}
			return style;
		},
	},
	watch: {
		value: {
			handler(val) {
				if (val !== this.currentValue) {
					this.currentValue = val === null ? '' : val;
					if (this.Quill) {
						this.Quill.pasteHTML(this.currentValue);
					}
				}
			},
			immediate: true,
		},
	},
	mounted() {
		this.init();
	},
	beforeDestroy() {
		this.Quill = null;
	},
	methods: {
		init() {
			const editor = this.$refs.editor;
			this.Quill = new Quill(editor, this.options);
			// 如果设置了上传地址则自定义图片上传事件
			if (this.type == 'url') {
				let toolbar = this.Quill.getModule('toolbar');
				toolbar.addHandler('image', (value) => {
					if (value) {
						this.$refs.upload.$children[0].$refs.input.click();
					} else {
						this.quill.format('image', false);
					}
				});
			}
			this.Quill.pasteHTML(this.currentValue);
			this.Quill.on('text-change', (delta, oldDelta, source) => {
				const html = this.$refs.editor.children[0].innerHTML;
				const text = this.Quill.getText();
				const quill = this.Quill;
				this.currentValue = html;
				this.$emit('input', html);
				this.$emit('on-change', { html, text, quill });
			});
			this.Quill.on('text-change', (delta, oldDelta, source) => {
				this.$emit('on-text-change', delta, oldDelta, source);
			});
			this.Quill.on('selection-change', (range, oldRange, source) => {
				this.$emit('on-selection-change', range, oldRange, source);
			});
			this.Quill.on('editor-change', (eventName, ...args) => {
				this.$emit('on-editor-change', eventName, ...args);
			});
		},
		// 上传前校检格式和大小
		handleBeforeUpload(file) {
			const type = ['image/jpeg', 'image/jpg', 'image/png', 'image/svg'];
			const isJPG = type.includes(file.type);
			// 检验文件格式
			if (!isJPG) {
				this.$message.error(`图片格式错误!`);
				return false;
			}
			// 校检文件大小
			if (this.fileSize) {
				const isLt = file.size / 1024 / 1024 < this.fileSize;
				if (!isLt) {
					this.$message.error(`上传文件大小不能超过 ${this.fileSize} MB!`);
					return false;
				}
			}
			return true;
		},
		handleUploadSuccess(res, file) {
			// 如果上传成功
			if (res.code == 200) {
				// 获取富文本组件实例
				let quill = this.Quill;
				// 获取光标所在位置
				let length = quill.getSelection().index;
				// 插入图片  res.url为服务器返回的图片地址
				quill.insertEmbed(length, 'image', process.env.VUE_APP_BASE_API + res.fileName);
				// 调整光标到最后
				quill.setSelection(length + 1);
			} else {
				this.$message.error('图片插入失败');
			}
		},
		handleUploadError() {
			this.$message.error('图片插入失败');
		},
	},
};
</script>

<style>
.editor,
.ql-toolbar {
	white-space: pre-wrap !important;
	line-height: normal !important;
}
.quill-img {
	display: none;
}
.ql-snow .ql-tooltip[data-mode='link']::before {
	content: '请输入链接地址:';
}
.ql-snow .ql-tooltip.ql-editing a.ql-action::after {
	border-right: 0px;
	content: '保存';
	padding-right: 0px;
}
.ql-snow .ql-tooltip[data-mode='video']::before {
	content: '请输入视频地址:';
}
.ql-snow .ql-picker.ql-size .ql-picker-label::before,
.ql-snow .ql-picker.ql-size .ql-picker-item::before {
	content: '14px';
}
.ql-snow .ql-picker.ql-size .ql-picker-label[data-value='small']::before,
.ql-snow .ql-picker.ql-size .ql-picker-item[data-value='small']::before {
	content: '10px';
}
.ql-snow .ql-picker.ql-size .ql-picker-label[data-value='large']::before,
.ql-snow .ql-picker.ql-size .ql-picker-item[data-value='large']::before {
	content: '18px';
}
.ql-snow .ql-picker.ql-size .ql-picker-label[data-value='huge']::before,
.ql-snow .ql-picker.ql-size .ql-picker-item[data-value='huge']::before {
	content: '32px';
}
.ql-snow .ql-picker.ql-header .ql-picker-label::before,
.ql-snow .ql-picker.ql-header .ql-picker-item::before {
	content: '文本';
}
.ql-snow .ql-picker.ql-header .ql-picker-label[data-value='1']::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value='1']::before {
	content: '标题1';
}
.ql-snow .ql-picker.ql-header .ql-picker-label[data-value='2']::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value='2']::before {
	content: '标题2';
}
.ql-snow .ql-picker.ql-header .ql-picker-label[data-value='3']::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value='3']::before {
	content: '标题3';
}
.ql-snow .ql-picker.ql-header .ql-picker-label[data-value='4']::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value='4']::before {
	content: '标题4';
}
.ql-snow .ql-picker.ql-header .ql-picker-label[data-value='5']::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value='5']::before {
	content: '标题5';
}
.ql-snow .ql-picker.ql-header .ql-picker-label[data-value='6']::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value='6']::before {
	content: '标题6';
}
.ql-snow .ql-picker.ql-font .ql-picker-label::before,
.ql-snow .ql-picker.ql-font .ql-picker-item::before {
	content: '标准字体';
}
.ql-snow .ql-picker.ql-font .ql-picker-label[data-value='serif']::before,
.ql-snow .ql-picker.ql-font .ql-picker-item[data-value='serif']::before {
	content: '衬线字体';
}
.ql-snow .ql-picker.ql-font .ql-picker-label[data-value='monospace']::before,
.ql-snow .ql-picker.ql-font .ql-picker-item[data-value='monospace']::before {
	content: '等宽字体';
}
</style>
